The Crime Scene

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Transcript of The Crime Scene

The Crime SceneQuiz - Question 1Types of SketchesThere are two types; rough sketch and final sketchRough Sketch - basic sketches made when you first get to the crime scene.Final Sketch - In complete detail and drawn to scale.VocabularyCross Contamination - The process by which bacteria or other microorganisms are unintentionally transferred from one substance to another, especially with physical evidence.

Control -Physical evidence whose origin is known, such as blood or hair from a suspect, that can be compared to crime scene evidence.

Finished Sketch - A precise rendering of the crime scene, usually drawn to scale.

Buccal Swab - Swab of inner portion; cheek cells are usually collected to determine the DNA profile of an individual.Physical EvidenceOnlookersIt is very important to exclude onlookers. Every individual who enters the scene has the potential to destroy or remove physical evidence.Recording a Crime ScenePhotography - Unsurpassed in the definition of detail it providesSketches - Record precise distances between important points in the crime scene.Notes - Provides a source of detailed information about the scene for future reference.The scene has to be completely unaltered in order for photos to be taken. VideoBy: Tabitha, Chris, and Ryan W.Physical evidence is any and all objects that establish that a crime has been committed or can link a crime and its victims or perpetrator. Examples. Broken glass, imprints, blood.VocabularyProcessing a Crime sceneThe first step in processing a crime scene is to secure and isolate the scene.Rough Sketch - A draft representation of all essential information and measurements at a crime scene. This sketch is drawn at the crime scene.

Chain Of Custody - A list of all persons who came into possession of an item of evidence.

Spiral - Crime scene search pattern.

Physical Evidence - Any object that can establish that a crime has been committed or can provide a link between a crime and its victim or between a crime and its perpetrator.

All crime scenes, including physical evidence, should be photographed, including points of entry and exit, and must also be taken from various angles.Notes Notes taken at the scene must include a detailed written description of the scene with the location of items of physical evidence recovered, the time discovered, by whom, and disposition of the item.Evidence That Must Be Collected at the SceneVictim's ClothingFingernail ScrapingsHead and Pubic HairsBloodVaginal, Anal, and Oral SwabsRecovered BulletsHand Swabs From Shooting VictimsAll of these must be collected because its hard to get after the victim is buried.Keeping IntegrityThe integrity of physical evidence is best maintained when the item is kept in its original condition as found at the crime scene.Rules For Trace EvidenceTrace evidence should not normally be removed from articles at a crime scene. Instead the entire object should be sent to the lab for processing.There are two exceptions however:If evidence is adhering to an object in a precarious manner, it should be removed and packaged.If evidence is found adhering to a large structure, it should be removed with forceps or other tools.Druggist's FoldSteps to Make:Fold in ThirdsFold in Half

Druggist fold is a better method to store evidence in opposed to ordinary envelopes because powders of fine particles will leak out of the corners of an envelope.How to Store EvidenceAll items should be placed in separate containers to prevent damage through cross contamination.Some evidence should be placed in an airtight container. An example is charred debris. This is to prevent evaporation of volatile residues.Items like clothing should be placed in individuality separate bags and air dried. Chain of Custody What is needed when a crime scene is at a protected area such as a house or private part of a business?

a) A VIP passb) A search warrantc) A police badged) Forensics ID

Chain of custody is a list of all people who came into possession of an item of evidence.Failure to substantiate the evidence's chain of custody may lead to serious questions regarding authenticity and integrity of the evidence. Substrate ControlA substrate control is a uncontaminated surface material close to an area where physical evidence has been deposited.The sample is used to ensure that the surface on which a sample has been deposited does not interfere with laboratory tests.Quiz - Question 2What is the best thing to use to collect drug evidence?

a) Remove the bodyb) Look for evidencec) Secure and Isolate the scened) Take PicturesQuiz - Question 10What is the best way to maintain the integrity of physical evidence?

a) Keep evidence in its original conditionb) Move the evidencec) Throw away unimportant evidenced) Refrigerate all evidenceQuestion 1 - Answerb. A Search Warrantc) Druggist's FoldQuestion 2 - Answera) A list of everyone who has been in contact with the evidenceQuestion 3 - Answerd) All of the above are physical evidenceQuestion 4 - Answerb) The scene is unalteredQuestion 5 - Answerd) All of the aboveQuestion 6 - Answerd) All of the aboveQuestion 7 - AnswerQuestion 8 - Answera) Charred Debrisc) Secure and Isolate the sceneQuestion 9 - AnswerQuestion 10 - Answersa) Keep evidence in its original condition